Background
From a known Point, I require to establish the nearest surrounding "visible perimeter" against a table of MultiLineStrings, as shown on the diagram.
I've searched this site with a number ...

I need to write PL/pgSQL stored procedure for calculation of intersection of multiple layers. For example, for three layers A, B, C this function should return ABC geometry:
Function takes as input ...

I am trying to extract the overlap of polygons that are within the same layer in 10. The layer came from a buffered street centerline and I'm trying to extract and delete the intersections from the ...

I performed an object-based image analysis using ENVI EX, and each of the classified features were exported as a shapefile. I transferred those shapefiles into ArcMap 10, and tried to intersect them ...

We have collected millions of cell phone strength readings. I am trying to group points of the same strenght that are within a distance of each other in to a polygon. I asked on the
postgis mailing ...

I am trying to intersect two SpatialPolygonsDataFrames and get a SpatialPolygonsDataFrame as the result. Unfortunately, using the gIntersection function from rgeos (which works impressively quickly ...

I'm having a hard time getting off the ground with this, and am trying to move away from ArcGIS / arcpy.
I have a shapefile with a network of polylines. I want to find/count all 2-way intersections, ...

I have a set of contour lines and a polygon set containing glaciers.
Because I want the glaciers to have blue contours, I need to split the contour lines at the glacier boundaries.
I can achieve this ...

Though a newbie to PostGIS, I'm having trouble solving something that I think should be farily straightforward.
I have two linestring tables, both consisting of simple, 2-node line objects: one has ...

I am using the intersect service from the ArcGIS Geometry service.
referring : http://help.arcgis.com/en/webapi/sil....htm#Intersect
I have modified it to make it work with polylines
it works fine to ...

I'm looking for an algorithm, high level solution, or even a library which can help me determine if two polygons intersect, in Python.
I have the vertices of the two polygons (These are single part ...

In map overlay, is intersection of map layers a commutative operation ie layer_A intersection layer_B = layer_B intersection layer_A?
If layer A is a square and layer B is a triangle. In this case, (A ...

How is the clip tool different from the intersect tool in terms of how it works or the result? I don't have a specific situation in mind. I was learning about each of these tools and was curious about ...

I'm using two geographies: one is made up of small areas (about 2200), the other large areas (about 70). Both cover all of Australia, and the small areas are not necessarily nested inside large areas. ...

I would like to have an example on how to use the Intersects function in the Field Calculator of QGIS.
Basically, I want to know which feature from a polylines layer intersects a polygons layer and ...

In JTS (or GEOS) you can't tell if two linestrings really cross each other. The result is exactly the same whether the lines simply have a point in common but don't cross or if they really cross.
Is ...